摘要
元件模型计算软土蠕变时,在不同的固结压力下,模型参数表现出显著的差异性,对土体物理指标及应力状态具有高度敏感性,计算时需要大量的参数校准和多次迭代调整,难以直接应用于工程。针对上述问题,以某填海工程为研究对象,通过一维固结蠕变试验,研究不同埋深软土的蠕变特性,并采用广义Kelvin模型对蠕变试验曲线进行拟合,通过归一化分析,提出模型中5个参数的经验公式。结果表明,归一化Kelvin模型具有参数简单、适用性强的特点,各参数可通过固结荷载、重力密度、孔隙比、液限孔隙比以及埋深等指标拟合;该模型与Burgers模型、Singh-Mitchell模型相比,能更好地拟合试验数据,相关系数可达0.98以上;与实际工程监测结果相比,该模型能够较好地反映和预测深厚软基的蠕变规律。
In the calculation of creep in soft clay using element models,model parameters exhibit significant variability under different consolidation pressures and show high sensitivity to soil physical indices and stress states.This necessitates extensive parameter calibration and multiple iterative adjustments,making direct application in engineering with difficulty.To address these issues,we focus on a sea reclamation project to investigate the creep characteristics of soft clay at varying depths through one-dimensional consolidation creep tests.Then we employ the generalized Kelvin model to fit the creep test curves,and carry out a normalization analysis to propose empirical formulas for five parameters within the model.The results show that the normalized Kelvin model features simplicity in parameters and strong applicability.The parameters can be fitted using indices such as consolidation load,gravity density,void ratio,liquid limit void ratio,and depth.Compared with the Burgers model and the Singh-Mitchell model,the Kelvin model better fits the experimental data,with correlation coefficients exceeding 0.98.Compared with actual engineering monitoring results,this model can effectively reflect and predict the creep behavior of deep soft foundations.
作者
岳长喜
潘伟
曹永华
于长一
陈举
YUE Changxi;PAN Wei;CAO Yonghua;YU Changyi;CHEN Ju(Tianjin Port Engineering Institute Co.,Ltd.of CCCC First Harbor Engineering Co.,Ltd.,Tianjin 300222,China;CCCC First Harbor Engineering Co.,Ltd.,Tianjin 300461,China;Key Laboratory of Port Geotechnical Engineering of the Ministry of Communication,Tianjin 300222,China;Key Laboratory of Port Geotechnical Engineering of Tianjin,Tianjin 300222,China;Key Laboratory of Geotechnical Engineering of CCCC,Tianjin 300222,China)
出处
《水运工程》
2025年第8期209-215,225,共8页
Port & Waterway Engineering
基金
中国交通建设股份有限公司科技项目(2023-ZJKJ-03)
中交第一航务工程局有限公司科技项目(2022-YHJJBGS-04)。
关键词
软土蠕变
归一化
广义Kelvin模型
沉降预测
soft soil creep
normalization
generalized Kelvin model
settlement prediction
